API API Certifications API-571 Questions & Answers

• Question 401:

  With sulfuric acid corrosion, mix points with _______ cause heat to be released and high corrosion rates can occur where the acid becomes diluted.

  A. Water

  B. Hydrogen

  C. H²S

  D. Caustic

  Correct Answer: A

• Question 402:

  HCL acid corrosion is found in several units, especially _______ and ________, units, hydroprocessing units and catalytic reformer units.

  A. Amine, crude

  B. Crude, Alkylation

  C. Vacuum, Amine

  D. Crude, Vacuum

  Correct Answer: D

• Question 403:

  Application of a post-fabrication stress relieving heat treatment of about ______ is a proven method of preventing carbonate cracking.

  A. 1100º F

  B. 1150º F

  C. 1200º F

  D. 1250º F

  Correct Answer: B

• Question 404:

  General or localized corrosion of carbon steels and other metals caused by dissolved salts, gases, organic compounds or microbiological activities is called ________.

  A. Flue Gas Corrosion

  B. Atmospheric Corrosion

  C. Cooling Water Corrosion

  D. None of the Above

  E. All of the Above

  Correct Answer: C

• Question 405:

  SSC is a form of hydrogen stress cracking resulting from the absorption of atomic hydrogen that is produced by the ______ corrosion process on the metal surface.

  A. HCl

  B. HF

  C. Sulfide

  D. Wet H²S

  Correct Answer: C

• Question 406:

  Areas of vulnerability in sulfuric acid Alkylation units include reactor effluent lines, reboilers, deisobutanizer, overhead systems and the _________ treating system.

  A. Caustic

  B. Sulfuric acid

  C. Catalyst

  D. H²S

  Correct Answer: A

• Question 407:

  The dewpoint of hydrochloric acid depends on the concentration of hydrogen chloride. It is typically about _________.

  A. 180º F

  B. 160º F

  C. 130º F

  D. 110º F

  Correct Answer: C

• Question 408:

  The "L" grade of stainless steels will sensitize if exposed more than several hours above _______ or long term above _____.

  A. 1200º F, 800º F

  B. 1000º F, 600º F

  C. 1000º F, 750º F

  D. 1100º F, 800º F

  Correct Answer: C

• Question 409:

  With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.

  A. Decrease

  B. Increase

  C. Stay the same

  D. None of the above

  Correct Answer: B

• Question 410:

  In general, the resistance of carbon steel and other alloys to High temperature corrosion is determined by the ________ content of the material.

  A. Molybdenum

  B. Chromium

  C. Carbon

  D. All of the above

  Correct Answer: B